Pen



FIG. 1 is a top plan view of a pen showing my new design;

FIG. 2 is a right side elevational view, the opposite side being a mirror image thereof;

FIG. 3 is a front elevational view thereof; and

FIG. 4 is a bottom plan view thereof.

The characteristic feature of the design resides in the clip member which is shaped and supported from the cap as shown. 

The ornamental design for a pen, as shown and described. 